Visual learning guide · v0.1
Turn a near-silent demonstration into traceable learning units without separating captions from action.
SOURCE FRAME
NO.086(3-4) Grinding Tools for Valve Rods, Nozzle Pins and Injector Housings
Executive summary
The on-screen text covers direction, light, start and speed controls; an order for valve-stem and housing-bore work; holder selection; forward/back grinding movement; a tapered rod; and diameter, flexibility, stroke and flow checks. There is no expert narration, so terminology and intent require practitioner confirmation.
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Learning routes
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Evidence-backed steps
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Source video
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Video 1 · Workshop filing
The practitioner changes how the file is presented for L-shaped corners, radiused curves and long straight edges, checking surface feel, missed areas, burrs, filed width and snagging.
Video 5 · Kyoto engraver
The practitioner distinguishes file size, cut and profile for the area, removes saw and hammer irregularities, and progresses from coarse to fine files. He uses sheen and a straightedge on flat faces, contact patterns and a smooth line on curves, then demonstrates bracing the work and cutting on the push stroke.
Video 6 · Dayel grinder
The video states a thickness-reduction purpose, powered magnetic table, digital Z adjustment and manual X movement, transparent cover, supported part types, auxiliary plates, motor and single-phase supply. It does not explain operating sequence, settings, stopping criteria or inspection.
Video 7 · DONGTAI compact grinder
The on-screen text covers direction, light, start and speed controls; an order for valve-stem and housing-bore work; holder selection; forward/back grinding movement; a tapered rod; and diameter, flexibility, stroke and flow checks. There is no expert narration, so terminology and intent require practitioner confirmation.
Video 8 · Titans ID wheel
The practitioner shows three components: main shaft, threaded mounting arbor and grinding wheel. He scuffs the arbor face with a file, cleans with alcohol, mixes resin and hardener, coats the arbor, drops on and spins the wheel, then adds epoxy in the centre. He links cleanliness and a good bond to the stated 20,000–30,000 rpm operating range.
Direction, light, start, speed and two work areas
The on-screen text identifies direction adjustment, light, start and speed controls, then states valve-stem grinding first and the housing middle bore second.
Locate the control identified by the on-screen text as adjustable direction.
The direction can be adjustedAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Distinguish the controls labelled by the source text as the light and start buttons.
Turn on, this is the light, this is the start buttonAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Locate the control identified on screen as speed adjustment.
Speed adjustmentAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Treat valve-stem and housing-middle-bore grinding as separate stages, as stated on screen.
First you need to grind the valve stem. Second, while grinding the valve stem, you need to grind the middle hole of the housing.AI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Clamp, match the insert and move forward/back
The on-screen text says to clamp the valve stem, select a part it calls the “inner bladder,” match it to stem thickness and fix it inside, then move forward or backward to grind.
Following the on-screen text, clamp the valve stem to be ground on the grinder.
Clamp the valve stem to be ground on the grinderAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Select the part the source text calls the “ground inner bladder.”
Then select the ground inner bladderAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Match the valve-stem thickness and fix the selected part inside, as stated on screen.
Corresponding to the thickness of the valve stem and fix it insideAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Start the grinder and use the forward/back movement stated on screen.
Then start the grinder and start moving forward or backward to grindAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Fix rod and ring, then check diameter
The on-screen text identifies a tapered rod, says to fix the rod on the grinder and install a ring, then measure its diameter.
Identify the part labelled on screen as a tapered rod.
This is a tapered rodAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Following the source text, fix the rod on the grinder and install the ring on the tapered rod.
When grinding, first fix the rod on the grinder and install the ring on the tapered rodAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Measure the diameter and identify when the desired size is reached, as stated on screen.
First you need to measure its diameter and tap it in when it reaches the size you wantAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Abrasive paste, flexibility, stroke and flow
The on-screen text states grinding the shell middle bore with abrasive paste, valve-stem flexibility inside the housing, then stroke measurement and a test-bench flow check after installation.
Following the source text, grind the shell middle bore and apply abrasive paste.
Grind the middle hole of the shell and apply abrasive pasteAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
Check the source-stated condition that the valve stem is flexible inside the housing.
The valve stem must be flexible inside the housingAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
After installation, measure stroke and use the stated test-bench flow check.
After installation, measure the stroke and then go to the test bench to check the flow rateAI drafted this step from the speech or on-screen source text below. Practitioner approval is required before formal use.
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